I am having freezes during gaming (settings as previous sshot posted). I am using a 4870x2 at default clocks. Is this a vtt issue , rtl issue or am I missing something quite obvious?
Also any suggestions for vtt freq are welcome (or is the default setting ok? for 200 bclk ram @ 1000 7-7-7-18)

Try your CPU PLL voltage at 1.8v not 1.5v (hard to see but looks like 1.5v)